<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert showIcon :closable="false" type="warning"
                title="注意：只允许为第三级分类设置相关参数！"></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 择商品分类的级联选择框 -->
          <el-cascader
            :props="cateProps"
            :options="cateList"
            v-model="selectedCateKeys"
            @change="handleCateChanged"></el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数 的面板-->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加参数
          </el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag
                  v-for="(item,index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="handleTagClose(index,scope.row)">{{item}}
                </el-tag>
                <!--输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加的按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini"
                           icon="el-icon-edit" @click="showEditDialog(scope.row)">编辑
                </el-button>
                <el-button type="danger" size="mini"
                           icon="el-icon-delete" @click="removeParams(scope.row)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态属性 的面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加属性
          </el-button>
          <!--静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag
                  v-for="(item,index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="handleTagClose(index,scope.row)">{{item}}
                </el-tag>
                <!--输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加的按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini"
                           icon="el-icon-edit" @click="showEditDialog(scope.row)">编辑
                </el-button>
                <el-button type="danger" size="mini"
                           icon="el-icon-delete" @click="removeParams(scope.row)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!--添加参数的对话框-->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDiolagClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!--修改参数的对话框-->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDiolagClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
    export default {
        name: "Params",
        data() {
            return {
                // 商品分类列表
                cateList: [],
                // 指定级联选择器的配置对象
                cateProps: {
                    expandTrigger: 'hover',
                    value: 'cat_id',
                    label: 'cat_name',
                    children: 'children'
                },
                // 级联选择器双向绑定到的数组
                selectedCateKeys: [],
                // tabs中被激活的页签名称
                activeName: 'many',
                // 动态参数的数据
                manyTableData: [],
                // 静态属性的数据
                onlyTableData: [],
                // 控制添加对话框的显示与隐藏
                addDialogVisible: false,
                // 新增的表单对象
                addForm: {
                    attr_name: ''
                },
                // 新增表单的验证规则对象
                addFormRules: {
                    attr_name: [
                        {required: true, message: '请输入参数名称', trigger: 'blur'}
                    ]
                },
                // 控制修改对话框的显示与隐藏
                editDialogVisible: false,
                // 修改的表单对象
                editForm: {
                    attr_name: ''
                },
                // 修改表单的验证规则对象
                editFormRules: {
                    attr_name: [
                        {required: true, message: '请输入参数名称', trigger: 'blur'}
                    ]
                }
            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            // 获取所有的商品分类列表
            async getCateList() {
                const {data: result} = await this.$http.get('categories')
                if (result.meta.status !== 200) {
                    return this.$message.error(result.meta.msg || '获取商品分类失败')
                }
                // console.log('result.data---', result.data)
                this.cateList = result.data
            },
            // 级联选择器选中项变化，会触发这个函数
            handleCateChanged() {
                this.getParamsData()
            },
            // tabs页签点击事件的处理函数
            handleTabClick() {
                console.log(this.activeName)
                this.getParamsData()
            },
            // 获取参数的列表数据
            async getParamsData() {
                // 数组长度不等于3，说明选中的不是三级分类
                if (this.selectedCateKeys.length !== 3) {
                    this.selectedCateKeys = []
                    this.manyTableData = []
                    this.onlyTableData = []
                    return
                }
                // 长度等于3，证明选中的是三级分类
                console.log(this.selectedCateKeys)
                // 根据所选分类的Id，和当前所处的面板，获取对应的参数
                const {data: result} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {sel: this.activeName}
                })
                // console.log('result---', result)
                if (result.meta.status !== 200) {
                    return this.$message.error(result.meta.msg || '获取参数列表失败')
                }

                result.data.forEach(item => {
                    // 先对item.attr_vals进行判空，不为空，则分隔，为空，则返回空数组
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
                    // 控制 新增el-tag文本框的显示与隐藏
                    item.inputVisible = false
                    // 新增el-tag 的文本框中输入的内容
                    item.inputValue = ''
                })
                console.log('result.data---', result.data)
                if (this.activeName === 'many') {
                    this.manyTableData = result.data
                } else {
                    this.onlyTableData = result.data
                }
            },
            // 监听新增对话框的关闭事件
            addDiolagClosed() {
                this.$refs.addFormRef.resetFields()
            },
            // 新增对话框的点击提交事件
            addParams() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) {
                        return
                    }
                    const {data: result} = await this.$http.post(`categories/${this.cateId}/attributes`, {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                    })
                    if (result.meta.status !== 201) {
                        return this.$message.error(result.meta.msg || '添加参数失败')
                    }
                    this.$message.success(result.meta.msg || '添加参数成功')
                    this.getParamsData()
                    this.addDialogVisible = false
                })
            },
            // 点击按钮，展示修改的对话框
            async showEditDialog(row) {
                // 查询当前参数的信息
                const {data: result} = await this.$http.get(`categories/${this.cateId}/attributes/${row.attr_id}`,
                    {params: {attr_sel: this.activeName}})
                if (result.meta.status !== 200) {
                    return this.$message.error(result.meta.msg || '获取参数信息失败')
                }
                this.editForm = result.data
                // console.log( result.data)
                this.editDialogVisible = true
            },
            // 监听修改对话框的关闭事件
            editDiolagClosed() {
                // 重置修改的表单
                this.$refs.editFormRef.resetFields()
            },
            // 修改对话框的点击提交事件
            editParams() {
                this.$refs.editFormRef.validate(async valid => {
                    if (!valid) {
                        return
                    }
                    const {data: result} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                        attr_name: this.editForm.attr_name,
                        attr_sel: this.activeName
                    })
                    if (result.meta.status !== 200) {
                        return this.$message.error(result.meta.msg || '修改参数失败')
                    }
                    this.$message.success(result.meta.msg || '修改参数成功')
                    this.getParamsData()
                    this.editDialogVisible = false
                })
            },
            // 删除按钮的点击事件
            async removeParams(row) {
                // 弹框提示用户是否要删除
                const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(error => error)

                // 如果确认删除，则返回值为字符串 confirm
                // 如果取消了删除，则返回值为字符串 cancel
                console.log('confirmResult--:', confirmResult)
                if (confirmResult !== 'confirm') {
                    return this.$message.info('已取消删除')
                }
                // 删除的业务逻辑
                const {data: result} = await this.$http.delete(`categories/${this.cateId}/attributes/${row.attr_id}`)
                if (result.meta.status !== 200) {
                    return this.$message.error(result.meta.msg || '删除参数失败')/* result.meta.msg */
                }
                this.$message.success('删除参数成功')
                this.getParamsData()
            },
            // 新增el-tag 的文本框失去了焦点 或摁下了enter（回车）键都会触发
            handleInputConfirm(row) {
                if (row.inputValue.trim().length === 0) {
                    row.inputValue = ''
                    row.inputVisible = false
                    return
                }
                // 如果没有走上面的if内容，则证明输入的内容，需要做后续处理
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false
                // 需要想后端发起请求，保存这次操作
                this.saveAttrVals(row)
            },
            // 将对 attr_vals 的操作，保存到数据库
            async saveAttrVals(row) {
                // 需要想后端发起请求，保存这次操作
                const {data: result} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(',')//row.attr_vals.toString()
                })
                if (result.meta.status !== 200) {
                    return this.$message.error(result.meta.msg || '修改参数项失败')
                }
                this.$message.success(result.meta.msg || '修改参数项成功')
            },
            // 点击 新增el-tag的按钮，展示文本输入框
            showInput(row) {
                row.inputVisible = true
                // 让文本框自动获得焦点
                // 笔记： $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            // 根据attr_vals数组中的索引，删除对应的的el-tag标签的参数可选项
            handleTagClose(index, row) {
                row.attr_vals.splice(index, 1)
                this.saveAttrVals(row)
            }

        },
        // 计算属性
        computed: {
            // 如果按钮需要被禁用，则返回true，否则返回false
            isBtnDisabled() {
                return this.selectedCateKeys.length !== 3;
            },
            // 当前选中的三级分类的Id
            cateId() {
                if (this.selectedCateKeys.length === 3) {
                    return this.selectedCateKeys[2]
                }
                // 没有三级分类，返回null
                return null
            },
            // 动态计算标题的文本
            titleText() {
                if (this.activeName === 'many') {
                    return '动态参数'
                }
                return '静态属性'
            }
        }

    }
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }

  .el-tag {
    margin: 5px
  }

  .input-new-tag {
    width: 120px;
  }

</style>
